I like to know how stuff works, so Hot Flashes from #Menopause always confused me. I did some digging this morning and now it all makes much more sense.
The hot flash is not what your body is reacting to - it is your body's REACTION!
Normally, your internal thermostat has a wide range of "normal." Estrogen keeps that range wide. Less estrogen means a narrower range. Normally, natural variations in your internal temperature don't trigger any alarms. But if the acceptable band becomes too narrow, even a tiny (perfectly normal) fluctuation can set off all your body's alarms.
If your temperature drifts a fraction above the acceptable range, the body starts trying to cool itself off. And it is this *response* that we register as a hot flash: blood vessels near the skin dilate to release heat, and we FEEL that heat as it's being released.
So it's not that you feel hot and your body freaks out. It's that your temperature wiggles and your body freaks out and THAT'S WHAT MAKES YOU FEEL HOT.
Hot flashes are kind of a self-fulfilling prophecy.
Yes, this can go in reverse: you can feel unreasonably cold as your body tries to preserve heat when your temperature wiggles too low.